M16A1 or AK-47? (Note: The A1, that's Fully Auto, not Burst like Treyarch fails to portray).

Considering the only game ive played with a full auto M16 is Left 4 Dead im gonna have to go with the AK. Not only because I have a gag reflex everytime I think L4D, but because the AK kicks some much ass in MW.